Here are the results from a stat guy and his use of bionomial statistics (old school 1972-92):
First the clutch performers: Ozzie Smith, Dave Collins, Lloyd Moseby, Tony Gwynn, Ruppert Jones, Rafael Ramirez, Alfredo Griffin, Jorge Orta, Rickey Henderson, and Bill Buckner. Now the chokers: Dave Winfield, Rod Carew, Lance Parrish, Jack Clark, Reggie Jackson, Roy Smalley, Tom Herr, Fred Lynn, Carl Yastrzemski, and Julio Franco. (Note that all of these players are good because of selection effects; one has to be a regular for about 7 seasons to pick up 1000 clutch plate appearances.)
What stands out immediately about this list is that the "chokers" are largely power hitters, while the "clutch performers" are largely singles hitters.
Conclusions
Cutch hitting is an important skill in baseball.
The difference between a good and a bad clutch performer is about 28% the difference between a good and a bad hitter, a much larger effect than had previously been thought from sabermetric work. So it is unlikely that any 0.250 hitters turn into 0.400 hitters in clutch situations, but there are 0.285 hitters who turn into 0.300 hitters.
Because of random effects, it is extremely difficult, if not impossible, to peg a specific player as a clutch performer or choker with a high degree of certainty. (For that matter, it is extremely difficult to ascertain much of anything about a player's batting skills to an accuracy better than 20 points of OBP based on one season's stats.)
That said, power hitters that perform better in the clutch are fairly rare, as are singles hitters that perform worse in the clutch. This can be used to make an educated guess of a player's clutch tendencies.
I don't pretend to understand exactly what makes one player a clutch hitter and another a choker. The correlation with slugging average probably gives a good clue, but half the "skill" seems to be uncorrelated with any obvious batting stats. However, it does appear that clutch hitting exists and that its importance has been generally underestimated.
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